155 - Did He Learn?
The idea of making the imp fly clearly came from Noah, who wanted to test something and see if it would work.
While he ordered all the imps to return to the battlefield to fight the monsters once again and help their fellow imps, Noah ordered one of the imps to stay because he wanted to "run a simple test".
He didn't do this sake of being as useful as possible, but just because he was a little bored of just watching and wanted to try something that could potentially be a lot of fun, and maybe even useful.
Holding the imp in his hands, Noah realized that even though they were very small, the reason they were so strong was already explained. Their weight was as great as that of a normal adult person. The imps probably had a lot of condensed muscle inside their little bodies, which was exactly what happened to Blessed in the higher ranks.